Editor's Note: In recent years, the broad masses of teachers at our university have been going deep in practice and learning from workers, peasants and soldiers. They first abolished their old textbooks and then retained what is useful in it in a critical way. Innovating through practice, they have written a series of new textbooks, among which "Transistor Circuits" is one. The editing group of this textbook considers the suppression of drift plays an important role in the production of a high...

Editor's Note: In recent years, the broad masses of teachers at our university have been going deep in practice and learning from workers, peasants and soldiers. They first abolished their old textbooks and then retained what is useful in it in a critical way. Innovating through practice, they have written a series of new textbooks, among which "Transistor Circuits" is one. The editing group of this textbook considers the suppression of drift plays an important role in the production of a high quality d. c. amplifier. The old textbooks did not offer any realistic solution to this problem which arised from production. Some authors(1)(2) have discussed this problem, but they all end up fundamentally at the same level of the equation (4-20) referred to in the new textbook. This equation tells the relationship between drift and some transistor parameters, but fails to explain it in a quantitative way. In order to enable the students to acquire knowledge that can guide them through productive activities, the editing group, with the help of the latest achievements of scientific works at home and abroad, have clarified the above mentioned quantitative relationship after carrying out a series of experiments. This attempt of theirs in the field of educational revolution has enabled them to write the following as a section of the "Transistor Circuits".

Published here are two sections of the last chapter of the newly prepared text Structural Mechanics. The conditio us forsimplification of local parts of a structure and of the structure as a whole are analyzed herein and a preliminary summary on the interrelation between actual structures and their mechanical models is given. Rational simplification of actual structures is a problem usually neglected in old textbooks. Authors of this text observed Chairman Mao's teaching: The nature of a thing is determined...

Published here are two sections of the last chapter of the newly prepared text Structural Mechanics. The conditio us forsimplification of local parts of a structure and of the structure as a whole are analyzed herein and a preliminary summary on the interrelation between actual structures and their mechanical models is given. Rational simplification of actual structures is a problem usually neglected in old textbooks. Authors of this text observed Chairman Mao's teaching: The nature of a thing is determined mainly by the principal aspect of a contradiction, the aspect which has gained the dominent position, analyzed the multifarious forms of connection between various parts of a structure and made an attempt to introduce the concept relative stiffness, which synthesizes various concrete forms of connection and makes possible a quantitative evaluation of the condition for simplification. The writing of new textbook is an important aspect of educational revolution. The selected sections of text materials published in the present issue and the preceding one of this journal are presented as materials for reference and discussion. They contain some new ideas in certain respects but are yet not perfect. From now on, we shall continually publish materials of such nature. We hope sincerely that all comrades engaged in textbook writing and all readers recommend to us such sections of new textbook material and take part in the study and discussion of them, thus promote educational revolution.

This paper introduces and reviews two new textbooks of basic surveying----oneis written by Jack B.Evett ( U.S.A. ) and the other is compiled by Hefei Polytechnic University ( China). Both of them arc intended for students of the departments concerned,except Surveying Engineering. Main contents in these two books are essentially the same. This paper offers some views and suggestions thereon.